Croteau, David, author
Sage, 2014
Buku Teks
Graber, Doris A., author
Congressional Quarterly Press, 1980
Buku Teks
Williams, Patrick, 1930-, author
Greenwood Press, 1978
Buku Teks
Hammitt, William E.
John Wiley & Sons, 1987
Buku Teks
Alison Alexander, Jarice Hanson, editor
McGraw-Hill/Dushkin, 2001
Buku Teks